#include "muduo/proto/codec.h"
#include "muduo/proto/dispatcher.h"
#include "muduo/base/Logging.h"
#include "muduo/base/Mutex.h"
#include "muduo/net/EventLoop.h"
#include "muduo/net/TcpServer.h"
#include "request.pb.h"
#include <iostream>
#include <unordered_map>
class Server
{
public:
    typedef std::shared_ptr<google::protobuf::Message> MessagePtr;
    typedef std::shared_ptr<bit::TranslateRequest> TranslateRequestPtr;
  
    typedef std::shared_ptr<bit::AddRequest> AddRequestPtr;

    Server(int port)
        : _server(&_baseloop, muduo::net::InetAddress("0.0.0.0", port),
                  "server", muduo::net::TcpServer::kReusePort),
          _dispatcher(std::bind(&Server::onUnknownMessage, this, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3)),
          _codec(std::bind(&ProtobufDispatcher::onProtobufMessage, &_dispatcher, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3))
    {
        // 注册业务请求处理函数
        _dispatcher.registerMessageCallback<bit::TranslateRequest>(std::bind(
            &Server::onTranslate,this,std::placeholders::_1, std::placeholders::_2, std::placeholders::_3
        ));
        _dispatcher.registerMessageCallback<bit::AddRequest>(std::bind(
            &Server::onAdd,this,std::placeholders::_1, std::placeholders::_2, std::placeholders::_3
        ));

        //设置消息回调处理函数
        _server.setMessageCallback(std::bind(&ProtobufCodec::onMessage,&_codec,
            std::placeholders::_1, std::placeholders::_2, std::placeholders::_3
        ));
        //
        _server.setConnectionCallback(std::bind(&Server::onConnection,this,std::placeholders::_1));
    }
    void start(){
        _server.start();
        _baseloop.loop();//开始事件监听
    }
private:
// TcpConnection 类代表了一个TCP连接，
// 它封装了与该连接相关的所有信息，包括连接的状态、读写缓冲区等。
    std::string translate(const std::string &str)
    {
        static std::unordered_map<std::string, std::string> dict_map = {
            {"hello", "你好"}, {"你好", "hello"}};
        auto it = dict_map.find(str);
        if (it == dict_map.end())
            return "错误！";
        else
            return it->second;
    }
    void onTranslate(const muduo::net::TcpConnectionPtr &conn,
                          const TranslateRequestPtr &message,
                          muduo::Timestamp /*时间戳*/) 
    {
        std::string req_msg = message->msg();
        std::string rsq_msg = translate(req_msg);
        bit::TranslateResponse resq;
        resq.set_msg(rsq_msg);
        _codec.send(conn,resq);
    }
    void onAdd(const muduo::net::TcpConnectionPtr &conn,
                          const AddRequestPtr &message,
                          muduo::Timestamp/*时间戳*/)
    {
        int num1 = message->num1();
        int num2 = message->num2();
        int result = num1+num2;
        bit::AddResponse resq;
        resq.set_result(result);
        _codec.send(conn, resq);
    }
    void onUnknownMessage(const muduo::net::TcpConnectionPtr &conn,
                        const MessagePtr &message,
                        muduo::Timestamp /*时间戳*/)
    {
        LOG_INFO << "onUnknownMessage: " << message->GetTypeName();
        conn->shutdown();
    }

    void onConnection(const muduo::net::TcpConnectionPtr &conn)
    {
        if(conn->connected())
        {
            LOG_INFO<<"新连接建立成功！";
        }else{
            LOG_INFO<<"关闭！";
        }
    }

private:
    muduo::net::EventLoop _baseloop; // 管理一个事件循环
    muduo::net::TcpServer _server;   // 服务器对象
    ProtobufDispatcher _dispatcher;  // 请求分发器对象--要向其中注册请求处理函数
    ProtobufCodec _codec;            // protobuf协议处理器--针对收到的请求数据进行protobuf协议处理
};
int main()
{
    Server server(8888);
    server.start();
    return 0;
}